Research On Streaming Media QoS Routing Based On Network Calculus In SDN Environment

With the development of the Internet and the increasingly rich demand of people,the streaming media application technology such as network TV,network business meeting,video chat,video surveillance,3D Virtual Reality(VR)has been gradually applied to everyone' s daily life.But this also makes the demand for IP traffic in the Internet increasing.With the loss of Internet resources,the network performance problems such as network congestion and transmission delay increase.This also reduces the quality of service(Quality of Service,QoS)of streaming media services,resulting in a poor user experience.At present,it is urgent to explore a new network architecture or algorithm to adapt to the transmission of a large stream of streaming media traffic.The software definition network is a new type of network innovation architecture proposed.In SDN networks,the creator separates the control layer from the data layer(that is,the logical layer and the device layer).The logical centralized control and management of the entire network is completed by the SDN controller.Compared with the traditional IP network,centralized control and management enable programmers to develop and implement all kinds of network functions and services according to their ideas,making everything simpler and more convenient.It is of great significance to study all the problems of streaming media streaming based on the SDN network environment.In order to ensure the quality of service and optimize the utilization of network resources,we must improve the network performance,including delay,bandwidth utilization and packet loss rate.The analysis of network correlation can always be a difficult problem,especially the performance analysis of end to end.Network Calculus(NC)just can realize the derivation of the end to end maximum delay and effective bandwidth.At the same time,I can use network calculus to conduct network modeling and performance analysis.The first part of this thesis focuses on the performance analysis modeling of streaming media flow based on network calculus.Two of the most core analytical tools:the arrival curve and the service curve.The two core tools are used to solve the maximum delay,the maximum bandwidth and the node buffer of the specific streaming media business,and standardize these related indicators to make it a comprehensive weight W.Using this weight W,we propose a QoS routing algorithm based on network calculus in Streaming environment.The second part of this paper is to build QoS routing optimization routing system,including algorithm function module,forwarding module and measurement module.The SMNC algorithm is embedded in the function module.Finally,the simulation experiments show that the SMNC algorithm has a low delay and high utilization efficiency for the transmission of the streaming media stream under the SDN environment.